ILS_LLZ [ILS Localizer]
A component of an ILS consisting of a VHF transmitter, radiating signals in the direction served by the ILS, to provide a straight line descent path in the vertical plane containing the centre line of the runway.
Rules:
  1. The position given by GEO_LAT, GEO_LONG must be plausibly close (less than 1 KM) to that of the end of the related (through ILS) RWY_DIRECTION.
Attributes
CODE_ID [Identification] mandatory
The coded identification of the ILS localizer.
Domain: CODE_ID_ILS_MLS
VAL_FREQ [Frequency] mandatory
The frequency of the ILS localizer.
Notes:
ILS frequencies shall be in the band : 108MHz - 117.975MHz.
Rules:
  1. The value of the VAL_FREQ has to lie between 108 MHz and 111.975 MHz (see ICAO Annex 10, Vol. 1, section 3.1.3.2).
Domain: VAL_FREQ
UOM_FREQ [Unit of measurement [frequency]] mandatory
The unit of measurement of the frequency.
Domain: UOM_FREQ
CODE_EM [Emission] optional
A code indicating the type of emission, as defined at the 1979 ITU World Administrative Radio Conference.
For example, A3E, NONA2a, G1D, etc..
Domain: CODE_EM_RDO
VAL_MAG_BRG [Magnetic bearing] optional
The magnetic bearing of the localizer beam, towards the localizer antenna.
Rules:
  1. The difference between VAL_MAG_BRG of the ILS_LLZ and VAL_MAG_BRG of the related RWY_DIRECTION cannot exceed 10 degrees (see ICAO Doc 8168, PANS OPS, Chapter 23, 'Offset Localizer').
Domain: VAL_ANGLE_BRG
VAL_TRUE_BRG [True bearing] optional
The true bearing of the localizer beam, towards the localizer antenna.
Rules:
  1. The difference between VAL_TRUE_BRG and VAL_MAG_BRG has to be consistent with the value VAL_MAG_VAR in the referred AD_HP, taking in consideration the current date and the annual rate of change (VAL_MAG_VAR_CHG in the referred AD_HP).
Domain: VAL_ANGLE_BRG
VAL_MAG_VAR [Magnetic variation] optional
The angular difference between True North and Magnetic North.
Rules:
  1. If VAL_MAG_VAR is specified, then DATE_MAG_VAR is mandatory..
Domain: VAL_ANGLE_MAG_VAR
DATE_MAG_VAR [Magnetic variation date] optional
The year when the magnetic variation was measured.
Domain: DATE_YEAR
VAL_WID_COURSE [Course width in degrees] optional
The localizer course width, in degrees.
Domain: VAL_ANGLE
CODE_TYPE_USE_BACK [Usability of the localizer signal in the back course sector] optional
A code indicating the usability of the localizer signal in the back course sector.
Domain: CODE_TYPE_USE_BACK_ILS
GEO_LAT [Latitude] mandatory
The latitude of the position of the ILS localizer.
Domain: GEO_LAT
GEO_LONG [Longitude] mandatory
The longitude of the position of the ILS localizer.
Domain: GEO_LONG
CODE_DATUM [Datum] mandatory
A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
Rules:
  1. All geographical coordinates should be expressed in the WGS 84 system.
Domain: CODE_DATUM
VAL_GEO_ACCURACY [Geographical accuracy] optional
The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
Rules:
  1. VAL_GEO_ACCURACY may be specified only if GEO_LAT and GEO_LONG have been specified and, in this situation, UOM_GEO_ACCURACY is mandatory.
Domain: VAL_DIST_HORZ
UOM_GEO_ACCURACY [Unit of measurement [geographical accuracy]] optional
The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
Domain: UOM_DIST_HORZ
VAL_ELEV [Elevation] optional
The vertical distance of the position from Mean Sea Level. The geoidal height of the position.
Rules:
  1. If VAL_ELEV is specified, then UOM_DIST_VER is mandatory.
Domain: VAL_DIST_VER
VAL_ELEV_ACCURACY [Elevation accuracy] optional
The vertical distance from the stated elevation within which there is a defined confidence of the true position falling.
Rules:
  1. VAL_ELEV_ACCURACY may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
VAL_GEOID_UNDULATION [Geoid undulation] optional
A distance separating the geoid and the ellipsoid at that position. In respect of WGS-84 geodetic datum, the difference between the WGS-84 ellipsoidal height and geoidal height represents geoidal undulation.
Rules:
  1. VAL_GEOID_UNDULATION may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
UOM_DIST_VER [Unit of measurement [vertical distance]] optional
The unit of measurement for vertical distances: elevation, geoidal undulation.
Domain: UOM_ELEV
VAL_CRC [Cyclic redundancy check] optional
Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
Notes:
Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
Domain: VAL_HEX
TXT_VER_DATUM [Vertical Datum] optional
Attribute to take the "Vertical Datum" (viz. the tide gauge to determine MSL - for example, "AMSTERDAM GAUGE", "NEWLYN" etc.).
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK
LANDING_PROTECTION_AREA [Landing/take-off protection area]
An area situated in the vicinity of a runway, FATO or TLOF, provided to protect aircraft during manoeuvring, take-off and/or landing operations.
Attributes
VAL_WID [Width] optional
The value of the physical width of the protection area.
Rules:
  1. If VAL_WID is specified, then UOM_DIM is mandatory.
Domain: VAL_DIST_HORZ
VAL_LEN [Length] optional
The value of the physical length of the protection area.
Rules:
  1. If VAL_LEN is specified, then UOM_DIM is mandatory.
Domain: VAL_DIST_HORZ
UOM_DIM [Unit of measurement [horizontal dimension]] optional
The unit of measurement for the horizontal dimensions of the protection area.
Domain: UOM_DIST_HORZ
[CODE_COMPOSITION] DEPRECATED-4.5 [Surface composition] optional
A code indicating the composition of the protection area surface.
For example, asphalt, concrete etc..
Domain: CODE_COMPOSITION_SFC
CODE_STS [Operational status] optional
A code indicating the operational status of a protection area.
For example, serviceable, unserviceable, closed, work in progress, etc.
Domain: CODE_STS_SFC
TXT_LGT [Lighting system description] optional
A textual description of the lighting system on the protection area.
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK
MKR [Marker [MKR]]
(ICAO) A marker beacon serving to identify a particular location in space by means of a 75MHz transmitter which transmits a directional signal to be received by aircraft flying overhead.
Attributes
CODE_ID [Identification] mandatory
The coded identification of the marker.
E.g. Dots, Dashes, Dot/Dash, etc..
Rules:
  1. The only allowable characters are '.' (#002E) and '-' (#002D). For example, '-.-' meaning 'dash-dot-dash', '-' meaning 'dashes', etc...
Domain: CODE_ID_MKR
GEO_LAT [Latitude] mandatory
The latitude of the position of the radio marker.
Domain: GEO_LAT
GEO_LONG [Longitude] mandatory
The longitude of the position of the radio marker.
Domain: GEO_LONG
CODE_CLASS [Classification] optional
A code indicating the class of the radio marker.
For example, fan marker, low-powered fan marker, Z marker.
Domain: CODE_CLASS_MKR
CODE_PSN_ILS [Position] optional
A code indicating the position, in a real or virtual ILS, of the markers situated on the centreline of a runway. For example: outer, middle, etc..
Notes:
Even when there is no ILS installed, the markers on the centreline of the runway are still referred to as "Inner Marker", "Middle Marker", etc..
Domain: CODE_PSN_ILS
VAL_FREQ [Frequency] mandatory
The value of the radio emission frequency.
Notes:
Radio Markers, as defined by ICAO, work only on the frequency of 75MHz.
Rules:
  1. The value of the VAL_FREQ must be 75 (MHz).
Domain: VAL_FREQ
UOM_FREQ [Unit of measurement [frequency]] mandatory
The unit of measurement of the frequency.
Notes:
Radio Markers, as defined by ICAO, work only on the frequency of 75MHz.
Domain: UOM_FREQ
TXT_NAME [Name] optional
The name of an en-route marker, if any.
Domain: TXT_NAME
VAL_AXIS_BRG [True bearing of the minor axis of the marker beacon] optional
The true bearing of the minor axis of the marker beacon.
(source: ARINC 424 Specification)
Domain: VAL_ANGLE_BRG
CODE_EM [Emission] optional
A code indicating the type of emission, as defined at the 1979 ITU World Administrative Radio Conference.
For example, A3E, NONA2a, G1D, etc..
Domain: CODE_EM_RDO
CODE_DATUM [Datum] mandatory
A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
Rules:
  1. All geographical coordinates should be expressed in the WGS 84 system.
Domain: CODE_DATUM
VAL_GEO_ACCURACY [Geographical accuracy] optional
The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
Rules:
  1. If VAL_GEO_ACCURACY is specified, then UOM_GEO_ACCURACY is mandatory.
Domain: VAL_DIST_HORZ
UOM_GEO_ACCURACY [Unit of measurement [geographical accuracy]] optional
The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
Domain: UOM_DIST_HORZ
VAL_ELEV [Elevation] optional
The vertical distance of the position from Mean Sea Level. The geoidal height of the position.
Rules:
  1. If VAL_ELEV is specified, then UOM_DIST_VER is mandatory.
Domain: VAL_DIST_VER
VAL_ELEV_ACCURACY [Elevation accuracy] optional
The vertical distance from the stated elevation within which there is a defined confidence of the true position falling.
Rules:
  1. VAL_ELEV_ACCURACY may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
VAL_GEOID_UNDULATION [Geoid undulation] optional
A distance separating the geoid and the ellipsoid at that position. In respect of WGS-84 geodetic datum, the difference between the WGS-84 ellipsoidal height and geoidal height represents geoidal undulation.
Rules:
  1. VAL_GEOID_UNDULATION may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
UOM_DIST_VER [Unit of measurement [vertical distance]] optional
The unit of measurement for vertical distances: elevation, geoidal undulation.
Domain: UOM_ELEV
VAL_CRC [Cyclic redundancy check] optional
Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
Notes:
Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
Domain: VAL_HEX
TXT_VER_DATUM [Vertical Datum] optional
Attribute to take the "Vertical Datum" (viz. the tide gauge to determine MSL - for example,: "AMSTERDAM GAUGE", "NEWLYN" etc.).
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK
MLS [Microwave landing system [MLS]]
A radio aid to navigation which provides precision navigation guidance for exact alignment and descent of aircraft on approach to a runway. It provides azimuth, elevation and distance indications.

(ICAO, An. 10) A precision approach and landing guidance system which provides position information and various ground-to-air data.
The position information is provided in a wide coverage sector and is determined by an azimuth angle measurement and a range (distance) measurement.
Attributes
CODE_ID [Identification] mandatory
The coded identification of the Microwave Landing System.
Domain: CODE_ID_ILS_MLS
CODE_CAT [Category] mandatory
A code indicating the category of the Microwave Landing System.
Domain: CODE_CAT_LDG_AID
CODE_CHANNEL [Channel] mandatory
A code indicating the channel on which the Microwave Landing System is operating.
Domain: CODE_CHANNEL_MLS
TXT_RMK [Remark] optional
This attribute is present to cover any additional information. For example, whether the configuration according to Annex 10 is 'Basic' or 'Expanded'.
Domain: TXT_RMK
MLS_AZIMUTH [MLS azimuth]
A component of an MLS consisting of an SHF transmitter and associated equipment, radiating signals in a volume of airspace served by the MLS, thereby furnishing azimuth indications to aircraft approaching the runway or back azimuth indications to aircraft departing from the runway or performing a missed approach procedure.
Rules:
  1. The position given by GEO_LAT, GEO_LONG must be plausibly close (less than 1 KM) to that of the end of the related (through MSL) RWY_DIRECTION.
Attributes
CODE_TYPE [Type] mandatory
A code indicating if it is 'normal' or 'back' azimuth equipment.
Domain: CODE_TYPE_AZM
VAL_TRUE_BRG [True bearing] optional
The true bearing of the azimuth beam, towards the azimuth antenna.
Rules:
  1. The difference between VAL_TRUE_BRG and VAL_MAG_BRG has to be consistent with the value VAL_MAG_VAR in the related AD_HP, taking into consideration the current date and the annual rate of change (VAL_MAG_VAR_CHG in the related AD_HP).
Domain: VAL_ANGLE_BRG
VAL_MAG_BRG [Magnetic bearing] optional
The magnetic bearing of the azimuth beam, towards the azimuth antenna.
Rules:
  1. The difference between VAL_MAG_BRG of the MLS_AZIMUTH and VAL_MAG_BRG of the related RWY_DIRECTION cannot exceed 10 degrees (see ICAO Doc 8168, PANS OPS, Chapter 23, 'Offset Localizer').
Domain: VAL_ANGLE_BRG
VAL_MAG_VAR [Magnetic variation] optional
The angular difference between True North and Magnetic North.
Rules:
  1. If VAL_MAG_VAR is specified, then DATE_MAG_VAR is mandatory..
Domain: VAL_ANGLE_MAG_VAR
DATE_MAG_VAR [Magnetic variation date] optional
The year when the magnetic variation was measured.
Domain: DATE_YEAR
GEO_LAT [Latitude] mandatory
The latitude of the position of the transmitter.
Domain: GEO_LAT
GEO_LONG [Longitude] mandatory
The longitude of the position the transmitter.
Domain: GEO_LONG
CODE_DATUM [Datum] mandatory
A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
Rules:
  1. All geographical coordinates should be expressed in the WGS 84 system.
Domain: CODE_DATUM
VAL_GEO_ACCURACY [Geographical accuracy] optional
The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
Rules:
  1. If VAL_GEO_ACCURACY is specified, then UOM_GEO_ACCURACY is mandatory.
Domain: VAL_DIST_HORZ
UOM_GEO_ACCURACY [Unit of measurement [geographical accuracy]] optional
The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
Domain: UOM_DIST_HORZ
VAL_ELEV [Elevation] optional
The vertical distance of the position from Mean Sea Level. The geoidal height of the position.
Rules:
  1. If VAL_ELEV is specified, then UOM_DIST_VER is mandatory.
Domain: VAL_DIST_VER
VAL_ELEV_ACCURACY [Elevation accuracy] optional
The vertical distance from the stated elevation within which there is a defined confidence of the true position falling.
Rules:
  1. VAL_ELEV_ACCURACY may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
VAL_GEOID_UNDULATION [Geoid undulation] optional
A distance separating the geoid and the ellipsoid at that position. In respect of WGS-84 geodetic datum, the difference between the WGS-84 ellipsoidal height and geoidal height represents geoidal undulation.
Rules:
  1. VAL_GEOID_UNDULATION may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
UOM_DIST_VER [Unit of measurement [vertical distance]] optional
The unit of measurement for vertical distances: elevation, geoidal undulation.
Domain: UOM_ELEV
VAL_CRC [Cyclic redundancy check] optional
Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
Notes:
Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
Domain: VAL_HEX
TXT_VER_DATUM [Vertical Datum] optional
Attribute to take the "Vertical Datum" (viz. the tide gauge to determine MSL - for example, "AMSTERDAM GAUGE", "NEWLYN" etc.).
Domain: TXT_DESCR
VAL_ANGLE_PROP_LEFT [Left angle of proportionality] optional
The value of the angle within which the azimuth indication is proportional to the deviation from the azimuth zero indication direction, and left of this direction from the azimuth antenna.
Domain: VAL_ANGLE
VAL_ANGLE_PROP_RIGHT [Right angle of proportionality] optional
The value of the angle within which the azimuth indication is proportional to the deviation from the azimuth zero indication direction, and right of this direction from the azimuth antenna.
Domain: VAL_ANGLE
VAL_ANGLE_COVER_LEFT [Left angle of coverage] optional
The value of the angle from the zero indication direction within which the azimuth indication is usable, and left of this direction from the azimuth antenna.
Rules:
  1. VAL_ANGLE_COVER_LEFT must be greater than VAL_ANGLE_PROP_LEFT.
Domain: VAL_ANGLE
VAL_ANGLE_COVER_RIGHT [Right angle of coverage] optional
The value of the angle from the zero indication direction within which the azimuth indication is usable, and right of this direction from the azimuth antenna.
Rules:
  1. VAL_ANGLE_COVER_RIGHT must be greater than VAL_ANGLE_PROP_RIGHT.
Domain: VAL_ANGLE
TXT_RMK [Remark] optional
Domain: TXT_RMK
MLS_ELEVATION [MLS Elevation]
A component of an MLS consisting of an SHF transmitter, and associated equitment radiating signals within a volume of airspace served by the MLS, thereby furnishing elevation information as an angular value to aircraft approaching the runway.
Rules:
  1. The position given by GEO_LAT, GEO_LONG must be plausibly close (less than 1 KM) to that of the threshold of the related (through MLS) RWY_DIRECTION.
Attributes
VAL_ANGLE_NML [Nominal glide path angle] optional
The normal glide path angle for the MLS installation.
Rules:
  1. VAL_ANGLE_NML must be greater than VAL_ANGLE_MNM.
Domain: VAL_ANGLE
VAL_ANGLE_MNM [Minimum angle] optional
The value of the lowest elevation angle authorized for an MLS procedure.
Domain: VAL_ANGLE
VAL_ANGLE_SPAN [Span angle] optional
The value of the span angle of the elevation transmitter signal between the lower and the upper limits.
Domain: VAL_ANGLE
GEO_LAT [Latitude] mandatory
The latitude of the position of the transmitter.
Domain: GEO_LAT
GEO_LONG [Longitude] mandatory
The longitude of the position of the transmitter.
Domain: GEO_LONG
CODE_DATUM [Datum] mandatory
A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
Rules:
  1. All geographical coordinates should be expressed in the WGS 84 system.
Domain: CODE_DATUM
VAL_GEO_ACCURACY [Geographical accuracy] optional
The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
Rules:
  1. If VAL_GEO_ACCURACY is specified, then UOM_GEO_ACCURACY is mandatory.
Domain: VAL_DIST_HORZ
UOM_GEO_ACCURACY [Unit of measurement [geographical accuracy]] optional
The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
Domain: UOM_DIST_HORZ
VAL_ELEV [Elevation] optional
The vertical distance of the position from Mean Sea Level. The geoidal height of the position.
Rules:
  1. If VAL_ELEV is specified, then UOM_DIST_VER is mandatory.
Domain: VAL_DIST_VER
VAL_ELEV_ACCURACY [Elevation accuracy] optional
The vertical distance from the stated elevation within which there is a defined confidence of the true position falling.
Rules:
  1. VAL_ELEV_ACCURACY may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
VAL_GEOID_UNDULATION [Geoid undulation] optional
A distance separating the geoid and the ellipsoid at that position. In respect of WGS-84 geodetic datum, the difference between the WGS-84 ellipsoidal height and geoidal height represents geoidal undulation.
Rules:
  1. VAL_GEOID_UNDULATION may be specified only if VAL_ELEV has been specified.
Domain: VAL_DIST_VER
UOM_DIST_VER [Unit of measurement [vertical distance]] optional
The unit of measurement for vertical distances: elevation, geoidal undulation.
Domain: UOM_ELEV
VAL_CRC [Cyclic redundancy check] optional
Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
Notes:
Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
Domain: VAL_HEX
TXT_VER_DATUM [Vertical Datum] optional
Attribute to take the "Vertical Datum" (viz. the tide gauge to determine MSL - for example, "AMSTERDAM GAUGE", "NEWLYN" etc.).
Domain: TXT_DESCR
TXT_RMK [Remark] optional
Domain: TXT_RMK
MSA [Minimum sector altitude [MSA]]
The lowest altitude that will provide a minimum clearance of 300m (1000ft) above all objects located in the sector.
Rules:
  1. Two Minimum Sector Altitudes defined using VAL_ANGLE_FM, VAL_ANGLE_TO, VAL_DIST_INNER, and VAL_DIST_OUTER should not intersect each other.
Attributes
VAL_ANGLE_FM [Beginning of angle] mandatory
The value of the 'from' (beginning) angle of an angle sector volume.
The angle sector begins at VAL_ANGLE_FM and ends at VAL_ANGLE_TO.
Rules:
  1. VAL_ANGLE_FM must have a value between 0 and 360 (degrees).
Domain: VAL_ANGLE_BRG
VAL_ANGLE_TO [Ending of angle] mandatory
The value of the 'to' or end angle of an angle sector volume.
Rules:
  1. VAL_ANGLE_TO must have a value between 0 and 360 (degrees).
Domain: VAL_ANGLE_BRG
VAL_DIST_INNER [Angle sector volume inner limit] optional
The radius value of the inner circular boundary of the sector.
If the sectors are based on an NDB co-located with a DME, or a VOR co-located with a DME, it is possible to define an additional circular boundary (DME arc) within a sector, dividing the sector into two sub-sectors, with the lower MSA value in the inner area. When this attribute has no value, it is assumed that the sector begins at the center.
Rules:
  1. If specified, VAL_DIST_INNER must be smaller than VAL_DIST_OUTER.
Domain: VAL_DIST_HORZ
VAL_DIST_OUTER [Angle sector volume outer limit] mandatory
The radius value of the outer circular boundary of the sector.
If the sectors are based on an NDB co-located with a DME, or a VOR co-located with a DME, it is possible to define an additional circular boundary (DME arc) within a sector, dividing the sector into two sub-sectors, with the lower MSA value in the inner area. When this attribute has no value, it is assumed to be 46 Km.
Rules:
  1. The radius of a sector (VAL_DIST_OUTER) can not be more than 50 NM..
Domain: VAL_DIST_HORZ
UOM_DIST_HORZ [Unit of measurement [horizontal distance]] mandatory
The unit of measurement for the radius of the inner and the outer circular boundaries.
Domain: UOM_DIST_HORZ
VAL_DIST_VER [Minimum sector altitude] mandatory
The value of the Minimum Sector Altitude.
Rules:
  1. The value of VAL_DIST_VER cannot be less than 300 metres.
Domain: VAL_DIST_VER
UOM_DIST_VER [Unit of measurement [vertical distance]] mandatory
The unit of measurement for the MSA value.
Rules:
  1. If the unit of measurement has the value 'FL' or 'SM', then the attribute CODE_DIST_VER must have the value 'STD' (standard pressure)..
Domain: UOM_DIST_VER
CODE_DIST_VER [Reference for the vertical distance] mandatory
A code indicating the base parameter for the MSA value.
Domain: CODE_DIST_VER
TXT_RMK [Remark] optional
Domain: TXT_RMK
MSA_GROUP [MSA group]
A set of Minimum Sector Altitudes which completely describe an area centred on a significant point, usually contained within a sector of 46km (25NM) radius.
Notes:
The MINIMUM SECTOR ALTITUDE and the MINIMUM SECTOR ALTITUDE GROUP will have to be revised if the Terminal Arrival Area (TAA) Concept is implemented, as presented in the Draft RTCA DO201A - Industry Requirements for Aeronautical Information (item 3.4.3.2.1).
Attributes
CODE_TYPE_ANGLE [Angle type] mandatory
A code indicating if the angle values used in the related MSA (VAL_ANGLE_FM, VAL_ANGLE_TO) are magnetic bearings, true bearings, or VOR radials.
Domain: CODE_TYPE_ANGLE_BRG
CODE_REF_ANGLE [Angle reference] optional
A code indicating whether the angle values used in the related MSA (VAL_ANGLE_FM and VAL_ANGLE_TO attributes) are either towards or from the reference point (navaid).
Notes:
When this value is not provided, it is considered that the angles are:
- from the reference SIGNIFICANT_POINT in the case of a VOR or TACAN;
- towards the reference SIGNIFICANT_POINT in all other cases.
Domain: CODE_DIR_REF
TXT_RMK [Remark] optional
Domain: TXT_RMK
NAVAID_LIMITATION [Navaid Limitation]
A limitation, such as coverage, usability, etc., of a navaid inside a circular sector volume.
Notes:
Where CODE_TYPE = coverage (ICAO)The 'volume' of airspace within which the service is provided and where signal power density is equal to or greater than the specified minimum.
Rules:
  1. If CODE_TYPE='CVR' ('coverage'), then VAL_DIST_OUTER is mandatory.
  2. If CODE_TYPE='SCL' ('scalloping'), then VAL_ANGLE_SCALLOP is mandatory.
Attributes
VAL_ANGLE_FM [From bearing] mandatory
The value of the 'from' (beginning) angle of the circular sector. The sector of circle begins at VAL_ANGLE_FM and goes clockwise up to VAL_ANGLE_TO.
Notes:
1) When VAL_ANGLE_FM is greater than VAL_ANGLE_TO, it means from VAL_ANGLE_FM to 360 degrees and from 0 degree to VAL_ANGLE_TO;
2) When VAL_ANGLE_FM is equal to VAL_ANGLE_TO, it means for that angle only;
3) A full circle is indicated with the values VAL_ANGLE_FM=0 and VAL_ANGLE_TO=360.
Domain: VAL_ANGLE_BRG
VAL_ANGLE_TO [To bearing] mandatory
The value of the 'to' (end) angle of the circular sector.
Domain: VAL_ANGLE_BRG
VAL_DIST_INNER [Inner limit] optional
The value of the inner limit of the circular sector.
Rules:
  1. If VAL_DIST_INNER is specified, then UOM_DIST_HORZ is mandatory.
Domain: VAL_DIST_HORZ
VAL_DIST_OUTER [Outer limit] optional
The value of the outer limit of the circular sector.
Rules:
  1. If VAL_DIST_OUTER is specified, then UOM_DIST_HORZ is mandatory.
  2. VAL_DIST_OUTER must be greater than VAL_DIST_INNER.
Domain: VAL_DIST_HORZ
UOM_DIST_HORZ [Unit of measurement [horizontal distance]] optional
The unit of measurement for horizontal distances.
Domain: UOM_DIST_HORZ
VAL_DIST_VER_UPPER [Upper limit] optional
The value of the upper limit of the circular sector volume.
Rules:
  1. If VAL_DIST_VER_UPPER is specified, then UOM_DIST_VER_UPPER and CODE_DIST_VER_UPPER are mandatory.
Domain: VAL_DIST_VER
UOM_DIST_VER_UPPER [Unit of measurement [upper limit]] optional
The unit of measurement for the upper limit value.
Rules:
  1. If the unit of measurement has the value 'FL' or 'SM', then the attribute CODE_DIST_VER_UPPER must have the value 'STD' (standard pressure)..
Domain: UOM_DIST_VER
CODE_DIST_VER_UPPER [Reference for upper limit] optional
A code indicating the convention used to measure the value of the upper limit.
Domain: CODE_DIST_VER
VAL_DIST_VER_LOWER [Lower limit] optional
The value of the lower limit of the circular sector volume.
Rules:
  1. If VAL_DIST_VER_LOWER is specified, then UOM_DIST_VER_LOWER and CODE_DIST_VER_LOWER are mandatory.
  2. If both VAL_DIST_VER_LOWER and VAL_DIST_VER_UPPER are specified, then the value of the lower limit must be smaller than or equal to the value of the upper limit (when converted to a common unit of measurement and reference system).
Domain: VAL_DIST_VER
UOM_DIST_VER_LOWER [Unit of measurement [lower limit]] optional
The unit of measurement for the lower limit value.
Rules:
  1. If the unit of measurement has the value 'FL' or 'SM', then the attribute CODE_DIST_VER_LOWER must have the value 'STD' (standard pressure)..
Domain: UOM_DIST_VER
CODE_DIST_VER_LOWER [Reference for lower limit] optional
A code indicating the convention used to measure the value of the lower limit.
Domain: CODE_DIST_VER
VAL_ANGLE_SCALLOP [Scalloping angle] optional
The value of the scalloping angle, which may affect the radial reading of a VOR or TACAN in plus or minus.
Rules:
  1. VAL_ANGLE_SCALLOP may be specified only for VOR or TACAN. .
  2. VAL_ANGLE_SCALLOP may be specified only if CODE_TYPE is 'SCL' or 'CVR'.
Domain: VAL_ANGLE
TXT_RMK [Remark] optional
Domain: TXT_RMK
NAV_SYS_CHECKPOINT [Checkpoint]
A point established and marked on the surface of an aerodrome allowing the checking of a navigation system (like VOR, GNSS, etc.) or initialisation of an inertial navigation system.
Attributes
CODE_TYPE [Type] mandatory
The type of navigation system for which the checkpoint has been established. For example, INS, VOR, GNSS, etc..
Domain: CODE_TYPE_NAV_CK_PT
TXT_RMK [Remark] optional
Domain: TXT_RMK